Use the Ninja Foodi's sauté function to fully cook the bacon. Once cooked, transfer the cooked bacon to a paper towel.
Turn off the Foodi and add the garlic to the remaining bacon grease. Cook until the garlic starts to turn golden brown, about 30 seconds, before adding the chicken broth.
Add the uncooked pasta to the broth and stir to create an even layer, submerging all of the pasta.
Seal the Foodi and cook on HI pressure for 3 minutes with quick release pressure (vent immediately).
Remove the lid and add the milk to the pasta. Gently stir while gradually adding the shredded cheese. Reserve 2 ounces of cheddar for the top. Once everything is melted and creamy, add the cooked bacon back to the mac and cheese along with the dry spices.
Top with the remaining 2 ounces of shredded cheddar and use the Foodi's broil function for 2-3 minutes until the cheese is melted to your liking. (You can also reserve the bacon for adding as a topping after broiling.)